gl, call program.use automatically when possible

src/mol-gl/compute/histogram-pyramid/reduction.ts

src/mol-gl/compute/histogram-pyramid/sum.ts

src/mol-gl/compute/marching-cubes/active-voxels.ts

src/mol-gl/compute/marching-cubes/isosurface.ts

src/mol-gl/renderable.ts

src/mol-gl/renderer.ts

src/mol-gl/webgl/render-item.ts

src/mol-math/geometry/gaussian-density/gpu.ts